Board Thread:Traders' Square/@comment-34456092-20180223064457/@comment-27876799-20180301141731

GoalScorer49 wrote: DaRealSebEmpire, that's impossible. There's no way of telling whether an egg has a shiny inside before you hatch it Actually, when Eggs are shown in the Trade Resort when trading with someone, the Pokémon inside will be revealed. This will also show its shininess.

Also, this "shop" probably isn't legit, the thread poster hasn't even posted a single reply.